diff --git a/build.dev.js b/build.dev.js
index 4b15b10..8b6a3a1 100644
--- a/build.dev.js
+++ b/build.dev.js
@@ -4,7 +4,7 @@ require('es.shim')
 const log = console.log
 const fs = require('iofs')
 const path = require('path')
-const scss = require('node-sass')
+const scss = require('sass')
 const chokidar = require('chokidar')
 const chalk = require('chalk')
 
diff --git a/build.prod.js b/build.prod.js
index 38247ef..4164ddf 100644
--- a/build.prod.js
+++ b/build.prod.js
@@ -4,7 +4,7 @@ require('es.shim')
 const log = console.log
 const fs = require('iofs')
 const path = require('path')
-const scss = require('node-sass')
+const scss = require('sass')
 const chalk = require('chalk')
 const { minify } = require('terser')
 
diff --git a/src/css/reset-basic.css b/src/css/reset-basic.css
index b559871..0c0ec12 100644
--- a/src/css/reset-basic.css
+++ b/src/css/reset-basic.css
@@ -65,7 +65,7 @@ code, pre, samp {font-family: Menlo, Monaco, Consolas, 'Courier New', monospace;
   --color-orange-2: rgb(241, 196, 15);
   --color-orange-3: rgb(205, 167, 13);
   /* default1 */
-  --color-plain-a: rgba(242, 245, 252, 0.5);
+  --color-plain-a: rgba(150, 204, 248, 0.5);
   --color-plain-1: rgb(242, 245, 252);
   --color-plain-2: rgb(232, 235, 244);
   --color-plain-3: rgb(218, 225, 233);
diff --git a/src/form/button.wc b/src/form/button.wc
index 19a97cc..0cd01a7 100644
--- a/src/form/button.wc
+++ b/src/form/button.wc
@@ -417,6 +417,8 @@ export default class Button {
           }, 10)
         }
         break
+
+      //
       case 'lazy':
         this.props.lazy = val >> 0
         break
diff --git a/src/form/input.wc b/src/form/input.wc
index e4f6918..dab0cf0 100644
--- a/src/form/input.wc
+++ b/src/form/input.wc
@@ -342,7 +342,8 @@ export default class Input {
     autofocus: false,
     readonly: false,
     disabled: false,
-    passwd: false
+    passwd: false,
+    lazy: 0 // 输入建议并发拦截时间, 单位毫秒
   }
 
   state = {
@@ -455,25 +456,11 @@ export default class Input {
     this.state.mvidx = null
   }
 
-  _updateAttr() {
-    var { maxlength, minlength } = this.props
-
-    if (maxlength && maxlength > 0) {
-      this.__INPUT__.setAttribute('maxlength', maxlength)
-    } else {
-      this.__INPUT__.removeAttribute('maxlength')
-    }
-    if (minlength && minlength > 0) {
-      this.__INPUT__.setAttribute('minlength', minlength)
-    } else {
-      this.__INPUT__.removeAttribute('minlength')
-    }
-  }
-
   mounted() {
     var prepend = this.__PREPEND__.assignedNodes()
     var append = this.__APPEND__.assignedNodes()
     var { passwd } = this.props
+    this.stamp = 0
 
     // 相同插槽, 只允许1个
     while (prepend.length > 1) {
@@ -490,8 +477,6 @@ export default class Input {
       this.__OUTER__.setAttribute('append', '')
     }
 
-    this._updateAttr()
-
     // 键盘事件
     this._handleSubmit = $.catch(this.__INPUT__, 'keydown', ev => {
       if (this.disabled || this.readOnly) {
@@ -518,7 +503,15 @@ export default class Input {
 
     // 输入状态事件
     this._handleChange = $.bind(this.__INPUT__, 'input', ev => {
-      ev.preventDefault()
+      let now = Date.now()
+
+      // 并发拦截
+      if (lazy && now - this.stamp < lazy) {
+        return
+      }
+
+      this.stamp = now
+
       this.dispatchEvent(
         new CustomEvent('fetch-suggest', {
           detail: {
@@ -563,7 +556,6 @@ export default class Input {
   }
 
   unmount() {
-    $.unbind(this.__INPUT__, 'wheel', this._handleWheel)
     $.unbind(this.__INPUT__, 'keydown', this._handleSubmit)
     $.unbind(this.__INPUT__, 'input', this._handleChange)
     $.unbind(this.__LIST__, 'click', this._handleSelect)
@@ -601,8 +593,18 @@ export default class Input {
 
       case 'maxlength':
       case 'minlength':
-        this.props[name] = val
-        this._updateAttr()
+        if (val === null) {
+          this.__INPUT__.removeAttribute(name)
+        } else {
+          let n = +val
+          if (n > 0) {
+            this.__INPUT__.setAttribute(name, +val)
+          }
+        }
+        break
+
+      case 'lazy':
+        this.props.lazy = val >> 0
         break
 
       case 'readonly':